Terrestrial living systems are all based on carbon compounds and use liquid water. They are self-contained, use macromolecules such as nucleic acids and proteins to function, and react to and adapt to their environment over the short-term (movement) and also over the long-term (evolution).

13.
The Basic Unit of Life on Earth is the Cell-and there are Two Types: Prokaryote Eukaryote plant animal

There are two types of cells, prokaryotes and eukaryotes, each of which have very different structures, genetic mechanisms and behaviors yet are composed of mostly the same kinds of biomolecules and have very similar genetic codes…

All organisms on earth are related by evolution from a common ancestor which existed on Earth about 4-3.5 billion years ago…this fact allows us to use studies of a few “Model” organisms to form the basis for our understanding of all Life…